<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    span::first-letter {
      font-size: 200%;
    }
    p::first-letter {
      font-size: 200%;
    }
  </style>
</head>
<body>
  <span>this is span</span>
  <p>“this is p”</p>
  <p>这。。。？！是 p</p>
</body>
</html>